Intercom base unit



FIG. 1 is a perspective view of the intercom base unit of the presentinvention;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof; and,

FIG. 6 is a top plan view thereof.

The broken lines in the Figures are for illustrative purposes only andform no part of the claimed design.

The ornamental design for an intercom base unit, as shown and described.